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Consider a crossover between Robin McKinley's Sunshine and the Harry Potter universe. The idea is that Charlie the cook is Charlie Weasley (or maybe his kid/grandkid). He gets the whole "needing to feed people thing" from Molly (obviously). Tried it out on the dragon reserve first, but when he went to settle down he poured it into restauranteuring instead.
I guess it would have to be implied that the Voldemort war 2 set off some reaction or something that caused all the problems Sunshine is aware of. But it also blew the Statute of Secrecy, which is why more people are aware of magic now :-)
Mel heard about Charlie at the dragon place in Romania.
Onyx Blaise--> Blaise Zabini. It kind of fits, cuz Sunshine talks about her dad's family being this huge big deal, and since Blaise is pure blood and in Slytherin, his family would be a huge big deal.
Is Rae's mom a muggle? Or Muggle born? Actually, it's implied she has some other blood in her -- there are several possibilities: goblins, merfolk, fairies, Veela... Technically, it's entirely possible to be fully centaur and look like a human...
Mel and his tattoos - obviously runic protections. Vampires already exist in both worlds, and cross breeds exist so Pat wouldn't be hard to explain.
Primary candidate for the Goddess of pain is going to be Pansy. Her total bigotry is why she hates crosses and unusual talents so much.